Bug ID: 371005
           Summary: Zoom function doesn't work properly on HiDPI Display
           Product: digikam
           Version: 5.2.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Preview

When viewing or editing an image, if the HiDPI display has set up the scale
factor, the image will zoomed based on the scale factor. for example, if an
image is 1000x1000 pixels and scale factor of display is set to 2, when choose
actual size or zoom to 100%, the image will be displayed in 2000*2000 pixels. 

I don't think this behaviour is right comparing to Mac and Windows on HiDPI
display. For image and video we should ignore the scale factor settings and
just display the content in pixel to pixel format. 

Reproducible: Always

Steps to Reproduce:
1. Open Image
2. Zoom to 100% 
3. check the actual size comparing to the size of exif information. If the
scale factor is not 1, the image size should be same as the exif one, not
calculated by the scale factor.

Expected Results:  
the image zoom function should not based on the scale factor settings

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